Track from which subdomain emails are being sent by email headers.

I've started receiving a lot of identical emails from one of my Multisite installations. The emails I receive are all identical, although, one is sent to me at demoname1@mydomain.com and the other to groupmail.mydomain.com (I get them two at a time. How do i track down which sub-domain they're coming from?

This should add blog id and title at the end of the email content only if the receiver is one of your specified emails. You will need to modify line$emails = array( 'emailone@gmail.com', 'emailtwo@gmail.com' );
and include the emails you need.

In short, all you need to do is create a folder named "mu-plugins" in your wp_content folder if it doesn't already exist. Create a new file with the file extension ".php", eg "custom-functions.php". Open file with an editor (eg notepad) and insert in the begging "<?php". Then you can paste the snippet I shared above under that line.

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